Talking about fundamental changes in billiards??? I've made a lot of changes over the years going from pool, not snooker, to three cushion...
In the meantime Slh, i think having fun playing and learning the game is most important...stick to what work for you and i agree with everyone here on that.... but as you get better and better, the need to change your fundamental will be inevitible and you will see it. It will take a while to feel and see it, dont rush into changing something that is working for you...
Coming from a similar background like you, I didn't change much of my stance besides staying up a little higher so i could see and imagine the ball's path. One thing that i kept changing was my bridge but i did it slowly over the years, not just a month or two. I went from an open pool bridge to the closed pool bridge (like efren reyes), then another bridge (similar to Blomdahl), and then a different bridge (check frederic coudron), and as much as i hate to wear gloves, I put it on recently and it also helped. search for names on youtube and you see what i'm talking about.
Slh, One thing that i had to change was the cue. I damaged my cuetec shaft playing three cushion. The shaft became so weak and vibrate a lot after that.
My three cushion cue changed as well... i went from very long and heavy cue, 19.5 oz cue to a shorter, less than 18 oz cue.
Goodluck and enjoy...